Yocto building , tf-a & u-boot

[Eldam]

Hi STµ Teams!

Another questions!

I'd like to have some precisions about yocto building :

I 'm able to build st-image-core, SDK1.2.

--Does the u-boot (and tfa) is built each time (ie: fetching sources, applying patch, compiling) when I'm bitbaking or does yocto takes a particular already built u-boot/tf-a from meta-st directory?

--If it compiles each time, and I want to add modification, Does I need to use the ".patch" method (and modify receipt in meta-st-stm32mp/recipes-bsp) or can I directly give u-boot&tf-a compiled files from developper package ?

--I need to modify the extlinux.conf, and add a directory in bootfs, is there a receipt to do this?

Have a nice day!

[Olivier GALLIEN]

Hi @Eldam​ 

I guess wiki page https://wiki.st.com/stm32mpu/wiki/How_to_cross-compile_with_the_Distribution_Package#Modifying_the_TF-A migth give you the guideline you are looking for.

Hope it help

Olivier